Lesson 3 · Bounce Driving — Knowledge ChecksAnswer key

When an if/else runs, how many of the two blocks execute?

1. A.Both, top to bottom
2. B.Exactly one — whichever matches the condition✓
3. C.Neither, unless you call them
4. D.It depends on the sensor

An if/else always runs exactly one branch: the if-block when the condition is True, the else-block when it's False.

What does `while True:` do?

1. A.Runs the loop once
2. B.Loops forever, until the robot is powered off or stopped✓
3. C.Causes a syntax error
4. D.Runs the loop only if a sensor is True

The condition True is always true, so the loop repeats endlessly — the standard pattern for continuous robot control.

left is 0.2 and right is 0.9 (threshold 0.5). Is `left > threshold or right > threshold` True?

1. A.False — the left sensor is on white
2. B.True — the right sensor is over the line, and or needs only one side✓
3. C.False — you need both sensors on the line
4. D.It causes an error

or is true when at least one side is true. Right (0.9 > 0.5) is true, so the whole condition is true — bounce.